Rhizophagus.'] CLAVICORNIA. 267 



R. politus, Hellw. Oblong, rather broad and flat ; colour unicolor- 

 ous black, shining ; head rather large, strongly impressed, finely punctured, 

 the punctuation being diffuse in front and close behind ; thorax subquad- 

 rate, as long as broad, diffusely and finely punctured, with a space between 

 centre and base smooth ; elytra with plainly punctured striae, Avhich 

 become evanescent towards sides and apex ; antennae and legs ferru- 

 ginous. L. 3-4 mm. 



Under bark of pines, and occasionally other trees ; rare ; Lee, Kent, one specimen by 

 sweeping (Douglas) j New Forest (Champion); Tintern and Kooke, Monmouthshire; 

 Hartlebury, Bewdley, and Salford Priors (Blatch) ; Sherwood Forest (Blatch and 

 Gorham) ; Stretford, near Manchester (Hardy and Keston) ; Scotland, Aviemore 

 (Champion). 



R. coeruleipennis, Sahib, (ceneus, Eicht.; cceruleus, Waltl.). Eather 

 short and broad ; head shining black, narrower than thorax, somewhat 

 finely punctured, antennas reddish with black club ; thorax black, not 

 longer than broad, narrower than elytra, with anterior and posterior 

 angles rounded, rather finely and thickly punctured ; elytra blue or 

 bluish-green, metallic, with fine punctured striee, sutural stria deepened 

 behind ; legs ferruginous with femora brownish ; under-side lighter or 

 darker reddish-brown. L. 3 mm. 



One of the rarest of our British beetles j three specimens have occurred in or near 

 the Lover's Walk at Matlock, Derbyshire ; they were taken by Mr. Matthews, Mr. 

 Garneys, and Mr. Crotch ; the specimen obtained by the last-named gentleman flew 

 from his beard on to the window after he had returned to the hotel ; one specimen has 

 also been recorded as taken by Mr. Taylor at Crosby, near Liverpool. 



TROGOSITID2E. 



In the Munich catalogue nineteen genera and one hundred and forty- 

 four species are enumerated as belonging to this family, and these have 

 since been added to ; only seven genera represented by fourteen species 

 are found in Europe, and three genera containing one species each in 

 Britain ; we need not, therefore, discuss at any length the position of 

 the family, which has by many authors been included under the Niti- 

 dulidse ; Lacordaire, however, appears to be right in separating them 

 from this latter family on -the ground of the structure of the maxillae and 

 tarsi ; in the Nitidulidae these latter are usually 5-jointed, with the 

 fourth joint very small ; in the Trogositidae they are 5-jointed, with the 

 first joint very short, the second to the fourth moderate, and the last 

 joint very long. 



Our three genera belong to two very distinct tribes, which may be 

 distinguished as follows : 



I. Form elongate without flattened margins TBOGOSITINA. 



II. Form oval or rounded, very convex, with distinct flattened 

 margins 



